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UNITED sTATEs PATENT oEEIcE.

WM. H. MORRISON AND M. W. E. DORAN, OF INDIANAPOLS, INDIANA.I

MORTISING-MACHINE.

Specification of Letters Patent No.` 11,430, dated August 1, 1854.

To all whom t may concern.'

Be it known that we, WM. HENRTY MORRI- soN and M. W. E. DORAN, of Indianapolis, in the county of Marion and State of Indiana, have invented new and useful Improvements in `:Boring and Mortising Machines; and we do hereby declare that the following is a full and exact description thereof, reference` being had to the accompanying drawings, and to the letters of reference marked thereon, which are hereby made a part of this specification. i

The same letters in yall the figures refer tothe same parts. n

The plan at present submitted shows a boring and mortising machine which may be used by hand by attaching a common brace to it.

A (Figure l)` is the shank, and T the twistedpart of the auger.

D, D, are two chisels `at the sides of the auger, which partially inclose the lower end of the latter. The shape of the cutting part of these chisels is shown in Figs. l` and 3. They are grooved on the inner sides, so as to iit as closely to the auger as possible. Both the auger and the chisels work in a frame of the following description:`E, E,

Figs. l `and 6, are two bars, divided near ends, as shown 1n Fig. 6. Through their lower ends, as seen 1n Figs.

l and 6, two screws (n, m) work. To the inner ends of these screws are attached two clamping plates P, P, which turn loosely on the ends of the screws ma. These are used to clamp the machine firmly on the piece of wood which is to be mortised. Above the points at which the bars E, E, are divided, a bar I connects them, having holes fz', i, in its ends, through which the former pass. The bars I, l, and E, E, are clamped togetherby screws m, m, which pass through the former and work on the sides of the latter. Through the bar I, are also holes d, d., Fig. 4, on which the shanks of the i chisels D, D, work, and the hole a., through which the shank of the auger A works. The bars E, E, are also connected at their upper ends by another bar Gr, the former passing through the latter and being secured by the nuts R, R. Through the bar G `are two holes h, 71 in which theshanks of the chisels work, and another hole H, in which a screw `thread is cut for` the screw Si. This screw `The plane in which the projecting band B B lies, not being` perpendicular to the axis of the auger, but somewhat inclined from the same, at each revolution of the auger the chisels D, D are `alternately raised and lowered.

c is the part designed to it into a common brace, or instead of this a cog wheel may bel placed there, or any other lmown method used of communicating rotary motion. i A number of such sets of chisels and augers may be combined together, asshown in Fig. 7, so that a mortise of greater or less length may be cut, as may be desired. The motion given to the chisels as described makes them cut better, and this arrangement of the chisels and auger clears out the core of the mortise, the shavings escaping between the chisels and the shaft of the auger.

We are aware that the auger and chisel have before beencombined in mortising machines, but not in themanner here described.

W'hat we claim as our invention and desire to secure by Letters Patent, is:

The combination, in boring and mortising machines, of the alternately rising and falling chisels, with the auger, so that both are in operation at the same time, substantially as above set forth, or by any known equivalent mechanical means; also the combination of a number of such sets of chisels and augers as described, for cutting mortises of greater or less length as may be desired.

WM. HENRY MORRISON. M. W. E. DORAN. Vitnesses:

S. H. JAMESON, A. D. FRAZEE. 

